Enhanced stability performance of nickel nanowire with 3D conducting network for planar sodium-nickel chloride batteries
Enhanced stability performance of nickel nanowire with 3D conducting network for planar sodium-nickel chloride batteries
复制标题
具有3D导电网络的镍纳米线用于平面钠氯化镍电池的增强稳定性能
DOI：
10.1016/j.jpowsour.2017.06.015
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发表时间：
2017
影响因子：
9.2
通讯作者：
Wen Zhaoyin
中科院分区：
文献类型：
--
作者：
Wu Tian;Zhang Sanpei;Ao Xin;Wu Xiangwei;Yang Jianhua;Wen Zhaoyin
无机电解质高温钠电池由于其热稳定性好、可靠性高、循环寿命长、安全性好等优点而受到越来越多的关注。尽管在过去的几十年中对Na-NiCl 2电池进行了深入的研究，但在阴极中设计稳定的导电网络仍然具有挑战性，但仍是理想的。在这项工作中，提出了一种新的阴极结构组成的镍纳米线与一个有效的电子传导网络的平面钠-氯化镍电池。在充电的第一阶段，Ni纳米线与Cl离子反应在表面生成NiCl 2，内部过量的Ni纳米线可以作为导电骨架，促进电子的快速传输。正如预期的那样，金属纳米线在0.05 C下100次循环后显示出130 mA h g−1（1014 mAh cm−2）的高比容量。同时，该电池在0.05 C下表现出稳定的循环性能，具有360 W h kg−1的高截止能量密度，远高于传统的管状钠-氯化镍电池（100 Wh kg−1）。长时间循环后阴极的扫描电子显微镜（SEM）图像显示了Ni颗粒的超缓慢生长，证实了所制备的纳米线阴极的优异稳定性。
High temperature sodium batteries with inorganic electrolytes are attracting increasing attention due to their high thermal stability, reliability, long-cycle life and safety. Despite the intensive investigation of Na-NiCl2batteries during last decades, designing a stable conducting network in the cathode is still challenging but desirable. In this work, a new cathode structure composed of Ni nanowires with an effective electron conducting network is proposed for planar sodium–nickel chloride batteries. During the first stage of charge, Ni nanowires reacted with Cl ion to form NiCl2on the surface and the excessive Ni nanowires inside can serve as conducting framework to facilitate the fast electron transport. As expected, the metal nanowires show a high specific capacity of 130 mA h g−1(∼14 mAh cm−2) at 0.05 C after 100 cycles. Meanwhile, the batteries show stable cycling performance at 0.05 C with a high cut-off energy density of 360 W h kg−1, much higher than the traditional tubular sodium-nickel chloride batteries (∼100 Wh kg−1). Scanning electron microscope (SEM) images of the cathode after long cycling reveal the ultra-slow growth of Ni particles, confirming the excellent stability of the prepared nanowires cathode.